Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
WITH TOYS — ON MODEL
In most circles of technical simulation in our country now, unfortunately, no funds to purchase even the basic necessities, not to mention the purchase of kits for making teaching AIDS...
HANGERS ARE DIFFERENT
DIMENSIONLESS. Coat-hangers are made of wood, plastic, metal, with a jumper for trousers and so on. But all of them are made under a certain" size clothes — to their disadvantage....
